linux-ext4 - [PATCH v5 03/16] exfat: Implement fileattr

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260116144616.2098618-4-cel@kernel.org>
Date: Fri, 16 Jan 2026 09:46:02 -0500
From: Chuck Lever <cel@...nel.org>
To: Al Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>
Cc: <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org,
	linux-xfs@...r.kernel.org,
	linux-cifs@...r.kernel.org,
	<linux-nfs@...r.kernel.org>,
	linux-f2fs-devel@...ts.sourceforge.net,
	hirofumi@...l.parknet.co.jp,
	linkinjeon@...nel.org,
	sj1557.seo@...sung.com,
	yuezhang.mo@...y.com,
	almaz.alexandrovich@...agon-software.com,
	slava@...eyko.com,
	glaubitz@...sik.fu-berlin.de,
	frank.li@...o.com,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	cem@...nel.org,
	sfrench@...ba.org,
	pc@...guebit.org,
	ronniesahlberg@...il.com,
	sprasad@...rosoft.com,
	trondmy@...nel.org,
	anna@...nel.org,
	jaegeuk@...nel.org,
	chao@...nel.org,
	hansg@...nel.org,
	senozhatsky@...omium.org,
	Chuck Lever <chuck.lever@...cle.com>
Subject: [PATCH v5 03/16] exfat: Implement fileattr_get for case sensitivity

From: Chuck Lever <chuck.lever@...cle.com>

Report exFAT's case sensitivity behavior via the file_kattr boolean
fields. exFAT is always case-insensitive (using an upcase table for
comparison) and always preserves case at rest.

Acked-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
---
 fs/exfat/exfat_fs.h |  2 ++
 fs/exfat/file.c     | 16 ++++++++++++++--
 fs/exfat/namei.c    |  1 +
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
index 176fef62574c..11c782a28843 100644
--- a/fs/exfat/exfat_fs.h
+++ b/fs/exfat/exfat_fs.h
@@ -468,6 +468,8 @@ int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
 		  struct kstat *stat, unsigned int request_mask,
 		  unsigned int query_flags);
+struct file_kattr;
+int exfat_fileattr_get(struct dentry *dentry, struct file_kattr *fa);
 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index 536c8078f0c1..79938072e1cb 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -12,6 +12,7 @@
 #include <linux/security.h>
 #include <linux/msdos_fs.h>
 #include <linux/writeback.h>
+#include <linux/fileattr.h>
 
 #include "exfat_raw.h"
 #include "exfat_fs.h"
@@ -281,6 +282,16 @@ int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
 	return 0;
 }
 
+int exfat_fileattr_get(struct dentry *dentry, struct file_kattr *fa)
+{
+	/*
+	 * exFAT is always case-insensitive (using upcase table).
+	 * Case is preserved at rest (the default).
+	 */
+	fa->case_insensitive = true;
+	return 0;
+}
+
 int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 		  struct iattr *attr)
 {
@@ -775,6 +786,7 @@ const struct file_operations exfat_file_operations = {
 };
 
 const struct inode_operations exfat_file_inode_operations = {
-	.setattr     = exfat_setattr,
-	.getattr     = exfat_getattr,
+	.setattr	= exfat_setattr,
+	.getattr	= exfat_getattr,
+	.fileattr_get	= exfat_fileattr_get,
 };
diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index dfe957493d49..a3a854ddc83a 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -1323,4 +1323,5 @@ const struct inode_operations exfat_dir_inode_operations = {
 	.rename		= exfat_rename,
 	.setattr	= exfat_setattr,
 	.getattr	= exfat_getattr,
+	.fileattr_get	= exfat_fileattr_get,
 };
-- 
2.52.0